I am with AT&T and have a smart phone(which i hate) with an unlimited data plan I got last december. My contract ends next december(2 year contract). I was planning on going to the AT&T store to get a no contract Iphone 4 for $600. The Iphone 4 uses a micro sim card. I was wondering if I could get a micro sim card cutter off of Amazon and put it in the Iphone. Will the phone still work with texting calling INTERNET and all that other stuff?